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The Herpetological Journal July Volume 9, Number 3 1999 ISSN 0268-0130 THE HERPETOLOGICAL JOURNAL Published by the Indexed in BRITISH HERPETOLOGICAL SOCIETY Current Contents HERPETOLOGICAL JOURNAL, Vol. 9, pp. 101-110 (1999) E VARIATION IN MANTIDACTYLUS MADECASSUS MILLOT & GUIR , 1950, A LITTLE KNOWN MALAGASY FROG, WITH RESURRECTION OF E MANTIDA CTYLUS PAULIANI G UIB , 1974 MIGUEL VENCES' AND FRANK GLA W2 1 Zoo/ogisches Forschungsinstitut und Museum Alexander Koenig, Bonn, Germany 2 Zoo/ogische Staatssammlung, Miinchhausenstr. 21, D-81247 Miinchen, Germany Based on morphological diffe rences, specimens currently attributed to the Malagasy montane frogspec ies Mantidactylus madecassus can be divided into two distinct groups, which correspond to the geographically separated populations from the mountain massifs of Ankaratra and Andringitra. The Ankaratra populations differ from the Andringitra populations by the lack of distinctly bilobed subarticular tubercles on the fingers; more extended webbing between the toes; and a less contrasting dorsal colour pattern. Furthermore, they are distinguished morphometrically. The name Mantidactyluspauliani Guibe, 1974 is available for the Ankaratra specimens and is hereby resurrected. A lectotype of M. madecassus is designated. The two species share a lack of vomerine teeth and both possess a very short snout, and should be co nsidered as closely related allopatric sister taxa. So far as is known, they occur between 1500 and 2500 m altitude (mainly above 2000 m), in brooks and their tributaries in areas of ericoid vegetation or of ro ck formationswith rupicolous plant co mmunities. A short review of Malagasy montane amphibian species is provided, confirming that montane habitat in Madagascar harbours an important diversity of species specialized to high-altitudes. Key words: Anura, Ranidae, Mantellinae, Brygoomantis, montane herpetofauna, Madagascar INTRODUCTION (see Millot & Guibe, 1950; Blommers-Schlosser & Blanc, which was not collected in the survey of Madagascar contains a rich diversity of habitat 1991), Raxworthy Nussbaum ) , and thus not in­ types, mainly due to the variety of climates. The eastern & (1996b cluded in the list of montane amphibians from rainforest belt is separated from the western arid re­ Madagascar published by Raxworthy Nussbaum gions by a high plateau on which special montane & ecosystems are found. The three highest massifs are (1996a). M madecassus is a representative of the most Tsaratanana in the north (2876 m), and Ankaratra speciose and heterogeneous anuran genus in Madagas­ (2642 m) and Andringitra (2658 m) in central Mada­ car. According to the most recent descriptions (Vences gascar. The Malagasy montane herpetofauna is known Glaw Vences, Andreone from extensive collections, harboured mainly in the et al., 1997; & 1997; et al., 1998), the endemic genus Mantidactylus currently con­ Museum National d'Histoire Naturelle (MNHN),Paris, tains described species classified into subgenera but basic information on the biology and ecology of 63 12 (Dubois, Glaw Vences, M most species is still lacking. 1992; & 1994). madecassus is included in the subgenus Brygoomantis Dubois, 1992 Recently, Raxworthy & Nussbaum (1996a) re­ (formerly group) which cur­ viewed the montane amphibian and reptile Mantidactylus ulcerosus rently consists of seven valid species communities of the Malagasy massifs of Andringitra, (Blommers-Schlosser Blanc, Glaw Vences, Ankaratra, and Tsaratanana, based on their own sur­ & 1991, & 1994). Brygoomantis are distinguished from repre­ veys. They found that a relatively large number of sentatives of other subgenera of by a species are restricted to the montane heathland, and re­ Mantidactylus derived karyotype (chromosome number = see jected the hypothesis that this habitat is artificial and 2n 24, Blommers-Schlosser & Blanc, 1991; not known in M faunistically depauperate. In another publication madecassus) and a combination of femoralgland struc­ (Raxworthy & Nussbaum, 1996b), the same authors ture (glands including a prominent rounded structure emphasized the similarities in the montane with ·external median depression, rudimentary glands herpetofauna between the Ankaratra and Andringitra present in females), sexual dimorphism in tympanum massifs. size (males having a larger tympanum than females), One frog species so farknown only fromhigh alti­ slightly distensible single subgular vocal sac in males, tudes of these two massifsis Mantidactylusma decassus slightly enlarged finger and toediscs, semiaquatic and partly diurnal habits, tadpoles with generalized mouthparts and distinct spiral-shaped intestine visible Correspondence: M. Vences, Zoologisches Forschungsinsti­ tut und Museum Alexander Koenig, Adenauerallee 160, through ventral skin, and advertisement call structure D-53 113 Bonn, Germany. Email: [email protected] (series of pulsed calls with low intensity). 102 M. VENCES AND F. GLAW In the course of our ongoing revisions of the frog Morphometric data were processed statistically with genera of Madagascar, we examined the type material the softwarepackage SPSS forWindows, version 6. 1.2. of Mantidacty/us madecassus and of its junior synonym Samples were compared for representative ratios by M pau/iani. In the present paper, we give a detailed re­ non-parametric Mann-Whitney U-tests. Data were description of both taxa and revalidate M pauliani transformed logarithmically (log ) to render relation­ 10 based on several morphological and morphometric dif­ ships between them linear. A Principal Component ferences. We also provide an updated list of montane Analysis (PCA) was carried out using the log -trans­ 10 amphibians of Madagascar, and a comparison between formed data (three factors extracted). the herpetofaunas of Andringitra and Ankaratra. RESULTS MATERIALS AND METHODS VARIATION IN M. MADECASSUS The following morphological measurements were According to Blommers-Schlosser & Blanc (1991), taken with a calliper to the nearest 0.1 millimeter: SVL M madecassus is known from seven localities: Ankara­ (snout-vent length), HW (head width), HL (head tra, Nosiarivo, Ivangomena, Andohariana, Am­ length), ED (horizontal eye diameter), END (eye-nos­ balamarovandana, and Anjavidilava. The first two lo­ tril distance), NSD (nostril-snout tip distance), NND calities are located in the Ankaratra massif and refer to (nostril-nostril distance), TD (tympanum diameter), the type series of the taxon Mantidactylus pauliani HAL (hand length), FORL (forelimb length), HIL Guibe, 1974 (which was synonymized with M made­ (hindlimb length), FOL (foot length), FOTL (foot cassus by Blommers-SchlOsser & Blanc, 1991), and to length including tarsus). All available specimens of the several ZMA specimens previously also referred to M taxon pauliani were measured, whereas in M pauliani (see Blommers-Schlosser, 1979). All other lo­ madecassus specimens measured were selected accord­ calities are located in the Andringitra massif according ing to their state of fixation, in order to get a sample in a to the map in Blommers-Schlosser & Blanc (1991), comparable state to the pauliani specimens. All meas­ which did not include information on voucher speci­ urements were taken by the same person (MY). mens. We found MNHN.vouchers for all mentioned Institutional abbreviations are as listed in Leviton et al. sites except Ambalamarovandana. Several other locali­ (1985). Webbing formula follows Savage & Heyer ties are corroborated by MNHN specimens and by one (1967) as modified by Myers & Duellman (1982) and ZFMK specimen (Fig. I); all these sites are located Savage & Heyer (1997). To facilitate comparisons with close to each other within the Andringitramassif . other species of Mantidactylus, we also give the for­ Detailed examination and direct comparison of all mula used by Blommers-Schlosser (1979) and most available specimens demonstrated that they can be clas­ subsequent authors who have published accounts on sified into two distinct groups, corresponding to the Madagascan anurans. Andringitra and Ankaratra samples, respectively. Dif­ Femoral glands were examined and photographed ferences are (a) subarticular tubercles on fingers (very under a stereo-microscope. Our description refers to the prominent, mostly bilobed in Andringitra specimens; macroscopic appearance of the gland on the ventral fe­ but single and indistinct in those fromAnka ratra; Fig. mur. In a few specimens, we also carefullyremoved the 2); (b) webbing (more extended in Ankaratra, generally skin of the ventral femur and turned it upside down; by reaching the disc of the fifth toe); and ( d) colouration this procedure, the gland structures, which remain com­ (darker and more uniform in Ankaratra). pletely attached to the skin, could be examined in more Additionally, distinct morphometric differences be­ detail and could easily be distinguished from simple tween both samples were found. Measurements of all granular thigh patches as present in many frogs. available Ankaratra specimens and of a representative FIG. I. Mantidactylus madecassus (ZFMK 5741 6 from FIG. 2. Ventral side of hands of type specimens of M. Cuvette Boby, Andringitra) in life. madecassus (MNHN 1953.246; left) and M. pauliani (MNHN 1972. 1 508, right). Not to scale. Note difference in shape of subarticular tubercles. TABLE 1. Measurements (in mm) of adult specimens of Mantidactylusmadecassus and M. pauliani. See Materials and Methods section for abbreviations of characters. LT = lectotype, PL T = paralectotype, HT = holotype, PT = paratype. Status Sex SVL HW HL TD ED END NSD NND FORL FOTL HAL HIL FL M. madecassus MNHN 1953.246 LT F? 27.5 9.6 9.7 1.9 3.1 1.8 2.2 3.0 16.6 22.4 7.9 47.0 15.3 MNHN 1989.3591 PLT M? 25.4 8.0 8.6 1.6 2.2 1.7 1.8 3.0 12.7 21.3 6.2 36.1 12.0 MNHN 1989.3592 PLT F? 31.0 9.6 10.2 2.3 3.0 1.8 2.0 3.0 16.7 21.0 7.6 43.1 14.5 < MNHN 1989.3594 PLT F? 29.2 10.6 10.3 2.9 3.2 2.0 2.2 3.3 16.3 17.2 7.7 43.7 14.7 > MNHN 1972.1182 F 32.0 10.8 11.l 2.3 3.5 1.9 2.6 3.2 17.2 24.8 8.5 51.0 18.3 �> 10.9 11.0 2.2 3.3 2.1 2.7 3.1 17.1 25.2 8.7 50.5 17.7 ::l MNHN 1972.1185 F 32.4 0 MNHN 1972.1190 M? 27.0 9.2 9.9 1.7 3.1 2.0 2.2 2.8 15.3 21.1 7.0 42.4 14.2 z MNHN 1972.1192 F 33.7 10.9 11.2 2.6 3.5 2.0 2.5 3.4 18.0 25.1 8.4 49.6 16.7 z MNHN 1972.
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